HTS tariff line · chapter 31
3102.60.00
Double salts and mixtures of calcium nitrate and ammonium nitrate
Analysis
HTS 3102.60.00 covers double salts and mixtures of calcium nitrate and ammonium nitrate under heading 3102 (mineral or chemical fertilizers, nitrogenous).
The normal trade relations rate here is zero, shared by about 100% of the 24 tariff lines in chapter 31, a useful check when a neighbouring dutiable line is a candidate. Duty-free at the general rate does not rule out additional duties under Chapter 99, such as Section 301 or Section 232 measures, which depend on the country of origin.
Census statistics map these goods to NAICS 325311 (Nitrogenous Fertilizer Manufacturing), an industry of 194 US establishments employing 7,033 people. That concordance is how imports of this line are compared with US output.
All 8 neighbouring lines carry the same duty-free rate, so a borderline choice between them changes the statistics reported, not the duty paid.
Every edition we compared, from Jan 2023 to Oct 2026 (Rev. 22), shows the same general rate of Free.
Neighbouring lines
| Line | Description | General rate |
|---|---|---|
| 3102.10.00 | Urea, whether or not in aqueous solution | Free |
| 3102.21.00 | Ammonium sulfate; double salts and mixtures of ammonium sulfate and ammonium nitrate: ammonium sulfate | Free |
| 3102.29.00 | Ammonium sulfate; double salts and mixtures of ammonium sulfate and ammonium nitrate: other | Free |
| 3102.30.00 | Ammonium nitrate, whether or not in aqueous solution | Free |
| 3102.40.00 | Mixtures of ammonium nitrate with calcium carbonate or other inorganic nonfertilizing substances | Free |
| 3102.50.00 | Mineral or chemical fertilizers, nitrogenous: sodium nitrate | Free |
| 3102.80.00 | Mixtures of urea and ammonium nitrate in aqueous or ammoniacal solution | Free |
| 3102.90.01 | Mineral or chemical fertilizers, nitrogenous: other, including mixtures not specified in the foregoing subheadings | Free |